Hi, I just bought new replacement seal for the knuckle. My old one was looking heavier, thicker and stronger. There was some cork maybe used for the seal itself. But anyway, it was two strong pieces of metal, easy to remove and install.
I bought the new one from Walck's. There is a rubber seal with a metal ring on one side. I guest the metal ring goes against the knuclke. Then I should put the felt and last the thin metal plate with the curve to the outside.
Thanks